Roy Lichtenstein

http://www.washingtonpost.com/lifestyle/style/roy-lichtenstein-a-retrospective-an-expansive-collection/2012/10/11/1996da08-13bc-11e2-be82-c3411b7680a9_gallery.html?hpid=z2#photo=1

La Expediciòn Shackleton

http://www.slate.com/blogs/behold/2012/10/11/the_photographs_of_frank_hurley_shackleton_s_antarctic_expedition_gone_wrong.html

http://www.elmundo.es/especiales/2011/12/ciencia/antartida/protagonistas/shackleton.html

http://obrasocial.catalunyacaixa.com/osocial/idiomes/1/fitxers/cultura/shackleton/index.html

http://www.viajeros.com/articulos/sir-ernest-henry-shackleton-el-explorador-inquebrantable